Thanks guys for the valuable information.
Vendor performed some more trials with different materials.
Here is what we tested:
1. CHEMLON (Polyamide 66) - softened and torque completely degraded
2. RYTON (40% Fiberglass PPS) - less torque degradation but connectors molded poorly, bad fit and...
I have a nylon panel mount connector that, when heated to our upper temperature limit of 85°C, suffers from significant torque degradation (from 6 in-lbs to 1 in-lbs).
I am trying to work with the vendor to spec a new material for the connector that will not yield as much under thermal loading...